Brake-drum vibration-damping device



10, 1931. c. w. FREY 1,791,495

I BRAKE DRUM VIBRATION DAIPING DEVICE Filed Feb. e. 1928 fuzz 527217? 1' w w 22y flak-9w 4% Patented Feb. 10, 1931 PATENr OFFICE COYLE W. FBEY, OF HARVEY, EJ418018 BRAKE-DRUM VIBRATION-DAHPHG DEVICE a umm filed February a, ma. Serial 1m. 252,961.

My invention relates to improvements in brake mechanisms and relates more especially to im rovements in automobile braxes, althougl it is not limited thereto.

e The usual practice for applyin the brake mechanism to automobiles is by t e application of brake bands or brake shoes which may or may not be lined, to cylindrical brake drums which are attached concentrically to to the Wheels of the car by means of bolts or rivets. The bands may be externally contracting or internally expandin and In some cases both types may be appli to the same drum.

The brake drum has all the attributes of a bell in that it is fastened by its center end wall to the hub and the annular brake engaging portion is of a highly vlbratile nature.

When the brakes of a vehicle such as an automobile are applied to the brake drum, a bi h frequency vibration or chattering of the vi ratile drum portion is commonly set up causing squealing, which is unpleasant.

It is therefore an object of my invention to rovide an im roved means whereb the hi h requency vi rations which resu t in t e brakes squealing, may be so damped or suppressed as to avoid the squealf.

Another object of my invention is to provide a device of the had described which 1S easy to install without requiring special tools therefor. l

Another object of my invention is to provide a device of the class described which will not detract from the symmetrical appearance of the brake drum. I

iitill another object of my invention 18 A9 to provide an improved braking mechanism 7 that is inexpensive to manufacture.

These and other objects of my invention will become apparent from the following description wherein: a

Fig. 1 is aperspective view of the brake drum employing one of the embodiments of my invention attached to the periphery thereof;

Fig. 2 is a view similar to Fig. 1, showing 59 the device installed on the inside of the drum;

Fig. 3 is a medial cross-section of the device of Fig. 1;

Fig. 4 is a perspective view of another embodiment of my invention;

Fig. 5 is a cross-section showin the method of applying the embodiment of %ig. 4;

Fig. 6 is a fragmentary View of the brake drum showing another embodiment of my invention;

Fig. 7 is an elevational view of the embodiment shown in Fi 6; v

Fig. 8 is a sectional View of the embodiment of Fig. 7 5

Fig. 9 1s a couplin that may be used in attaching the device 9 Fig. 1, to the drum; and

Fig. 10 is an elevational view of an adjust: able coupling.

Referring now to the figures of the drawings wherein like parts are designated by like reference characters: at 1, I have shown a brake drum which may comprise a pressed steel cylinder having one end thereof open and the other substantially closed end having a central a erture 3, permitting the drum to be Iaced over the hub to which it is fastened y bolts or rivets inserted through apertures 2 through the drum, disposed radially of the central aperture. At 4., I have shown a pair of braking elements herein illustrated. as brake shoes which, it is understood, are fastened to the housin by means of a in 5 which also serves as a hmge for the two rake shoes and which are adapted to be expanded by the expander-7 with proper rods not shown which lead to the brake pedals of the car.

On the outer surface of the annular walls of the drum I have superposed an annulus or band 8 of preferably semi-circular cross-section composed of rubber, leather or other like material preferably having a cored center. The annulus may be formed of a strip of material and fastened by means of a wire or steel member 10 inserted in the hole 9 and fasteningthe ends together. The band 8, so formed, is normally preferably of an inner diameter slightly smaller than the outside diameter of the drum, and when the annulus is forced onto the drum, by reason of its resilient character, it adheres tightly thereon,

rivets 15.

with the surface 11 compressed in contact with the drum.

For brakes of the external contracting type, the device of Fig. 2 will be constructed as if that of Fig. 1 were turned inside out, with the face 11 as its periphery and which, being of slightly larger diameter than the inside diameter of the drum, is forced into the drum and will be held therein by'reason of the pressure of the face 11 compressed against the inner circular wall 6 of the drum.

I also contemplate fastening the annulus to the drums without removing the wheels from the car, b means of any suitable clamp such as that shown in Fig. 9, wherein the ends of the steel rin 10, which is disposed in the hole 9, are nt at approximately right angles and provided with apertures 18 to receive a bolt 19, which may be tightened and the annulus drawn tightly upon the drum.

The coupling may be made adjustable to vary the tension of the annulus by providing turn buckle 23 as shown in Fig. 10 which engages the right and left hand threads of the steel ring ends 21 and 22, respectively.

In vehicles employing brakes of both the internal expanding and external contracting type applied to the same drum, I contemplate applying an annular strip of rubber or like material 20 of concavo-convex cross-section to the inner end wall of the brake drum adj acent the brake an aging portion and which may be held therein by means of a ring 13 superposed upon the stri which clamps it securely a inst the wall 14 by means of he annulus ma contact with the inner vibrating ortion o the drum, there usually being a' s 'ght clearance between the brake shoe and the end wall.

I sometimes attach to the end wall 14 of a brake drum, a lurality of concavo convex disks 16 of rub r or ike material having apertures 17 which will allow them to be bolted to the brake drum end wall.

Although I have herein described the use of rubber for the device, any semilastic or fabric material may be so used, an I do not desire to limit my invention thereby, but desire to include any material that may have vibration absorbing qualities.

Having thus described my invention in certain specific embodiments I am aware that numerous and extensive departures may be made from the embodiments herein illustrated and described without departing from the s irit of my invention.

I c aim:

1. In combination with the brake drum of a vehicle a tubular annulus carried by the drum, said annulus substantially comprised of a material relatively non-conductive to sound vibrations, and a metallic core member disposed in the annulus, and contracted in diameter to hold said annulus tightly of a material relatively non-conductive to sound vibrations, and having a flexible metallic core member longitudinally disposed therein, and contracted in diameter to hold said annulus tightly pressed against the brake drum.

In testimony whereof I hereunto afi'ix my signature this 15th da of Februar 1928. OYLE W. REY. 

